G.783 Pointer Sequences Explained - Agilent Technologies OmniBER 720 User Manual

SONET_Usr.bk Page 46 Wednesday, December 13, 2000 11:11 AM
Selecting Test Features - SDH Operation
Adding Pointer Adjustments
4 G.783 - Provides pointer movements according to ITU-T G.783:

G.783 Pointer Sequences Explained

In addition to the BURST, NEW POINTER and OFFSET pointer movements
described, the OmniBER 720 can also generate pointer sequences (pointer
movements) according to ITU-T G.783, T1.105.03 and GR-253. Note that T.105.03/
GR-253 sequences are explained on page 88 in the SONET Test Features Chapter.
Before running a pointer sequence you can elect to run an initialization sequence,
followed by a cool down period, and then run the chosen sequence. This is selected
using the
pointer sequences are made up of three periods: the Initialization Period, the Cool
Down Period, and the Sequence (Measurement) Period, illustrated in the following
figure:
Note: SINGLE (e), BURST (f) and PHASE TRANSIENT are Non Periodic
Sequences.
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Pointer Line Rate
Type
AU Constant
AU Offset
TU Constant
TU Offset
Choose the G.783 ADJUSTMENT TYPE.
Choose the POLARITY, INTERVAL and PATTERN (where applicable) for the
selected sequence.
Choose POINTER SEQUENCES
sequence and to stop the pointer sequences.
STOP INIT
key shown in the display on the previous page. Initialized
START INIT
Non Periodic Sequence Initialization Sequence
Periodic Sequence
Initialization
AU Payload (VC) TU Payload (TU)
Rate
Offset Tracks AU Payload
Constant
Constant
Tracks Line Rate
to generate the selected G.783
START INIT
No Pointer Activity Sequence
Continuous Sequence
Cool Down
Measurement
Rate
Constant
Offset
Constant
Time
Period